diff options
Diffstat (limited to 'src/signal/sigaction.c')
| -rw-r--r-- | src/signal/sigaction.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/src/signal/sigaction.c b/src/signal/sigaction.c index a4737404..7232d4b9 100644 --- a/src/signal/sigaction.c +++ b/src/signal/sigaction.c @@ -21,6 +21,13 @@ int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigact { struct k_sigaction ksa, ksa_old; unsigned long set[_NSIG/(8*sizeof(long))]; + /* Doing anything with the disposition of SIGABRT requires a lock, + * so that it cannot be changed while abort is terminating the + * process and so any change made by abort can't be observed. */ + if (sig == SIGABRT) { + __block_all_sigs(&set); + LOCK(__abort_lock); + } if (sa) { if ((uintptr_t)sa->sa_handler > 1UL) { a_or_l(handler_set+(sig-1)/(8*sizeof(long)), @@ -44,21 +51,13 @@ int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigact a_store(&__eintr_valid_flag, 1); } } - /* Changing the disposition of SIGABRT to anything but - * SIG_DFL requires a lock, so that it cannot be changed - * while abort is terminating the process after simply - * calling raise(SIGABRT) failed to do so. */ - if (sa->sa_handler != SIG_DFL && sig == SIGABRT) { - __block_all_sigs(&set); - LOCK(__abort_lock); - } ksa.handler = sa->sa_handler; ksa.flags = sa->sa_flags | SA_RESTORER; ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore; memcpy(&ksa.mask, &sa->sa_mask, _NSIG/8); } int r = __syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, _NSIG/8); - if (sig == SIGABRT && sa && sa->sa_handler != SIG_DFL) { + if (sig == SIGABRT) { UNLOCK(__abort_lock); __restore_sigs(&set); } |